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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b08fd350f6c3c2e6359c844939a8e2eb4ef4af49e86fd33777e4bb9c351b42d' 
  AND token = '3tdJYN34DwcCyb0o7oPLelp4u5e5NUJvYvf5Opqqw/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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