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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5525dbadd80b583e129633cc46a47e8d6a1d43bbffff738ab1895e0bcd6740e' 
  AND token = 'fkuwNsQdDxO23y72UCpIpY/9VgG9B4Go62BA9oKmRXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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