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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5ae7383114e6019b0fe09a3711d3483bf368472456bc8d280baa9b62e8e3953' 
  AND token = 'soGE31l176s3a7iP+9nP7YP42vMq3bDot5ZAk5vqkaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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