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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdaad142cc280f2ccb54a99e1d3ba7547825eef758b924beeffaf840bfe77e4a' 
  AND token = '65IuPQ3a4/89bUnAMA5wBJRepUK61MmHkEds6V+TX9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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