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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3c2d0089db584fc036617cabfe99970a55010ac6a42816822882e502ed8414e' 
  AND token = 'ug5zdDdvqyNVN2ehNnsWNJj844oz/WSlBzhHFfunGmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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