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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cff95c2725667edfde9bcda4091911ea735da45caa357adc10ad8d542f09b9db' 
  AND token = '1aKq8h279tdOQb6/JWbZcYWtf3lvrN0ftIMHCFIeLwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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