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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb66a1b15029426471e2c090da326e5924338fd38c9634349d46e3f4eae0ca5f' 
  AND token = '/hssHuakiuWIzQCSP/kK18xL7xslm0tvZ5wSadq7iC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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