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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a362825d86120029a07dbead6b9485538bb34997ee46e0544d4b6eed06227fb9' 
  AND token = 'XdVeWZfrXxRC3Y/O/iDHp7I8p396A2RLaJwJ/ab8aFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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