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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0bf662a372dbd7bfc03519d2c1c7c6adfe24fa419e1bf0eb822790f7b5e591f' 
  AND token = 'wi0rVTjftIXvuPdVO3Tb69ngF17wEHGNpH8P1L8VHDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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