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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '792d9874551e85b7a6cb46181b58e3f517eefd46cfaeda4e0544d405d375922e' 
  AND token = 'dQtXqS0Gr5FVKgG3jLrPKYmxHcaPfCOkxDyunt5GTAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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