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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1f5ad389d6e0f474d0ff62972082cfd4990dc76e14817f74139bc9f0a5e03f0' 
  AND token = 'qTejwM/nTnmDQWthChqzm3hNgQOGCUyPpxMjqNtA1HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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