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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a00ad3b0a4774d9641a0baec0daba9062ad2ff39eae0691d2cf005e7a05535f5' 
  AND token = 'TnK/4Tz0znAFQzu8KwxEsbU3nPEm2bDBDgr5q/Jk5wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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