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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '418002808b5e3cb6b9e8f7a894daf5eb6adaa0fef2fb65eb3eccf9fecfd6e24b' 
  AND token = '6OI9xi9l+qw0QkqtOB4QmwU7mKx8roJjKtmU1x4kE/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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