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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbe18b373b4820cb099d4688ab0853947fa40f6eab137ce9a8c39bba1260f167' 
  AND token = 'GIH5hQfkMduR/qlvkPLOftnYt69wGz4DGhUuo1Fa8LM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00148

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}