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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5ec9d136d0faa2edf34c327956ceb3a5a8dc7d9b837c65a1ab1bc538130ec85' 
  AND token = 'ffubLGZ6ROCQYNMb65iboMIlR1YqtspEjrcjuPj3YPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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