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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35320ed18cf931711d44e7992b254de9e5e862b92279404520debe700a8b42b8' 
  AND token = 'SRAhqkE7vHqzpKhw6Hw7zH2nBbu0hwHQ+M5y3zv+p+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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