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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8960eb153febb2dae1f762b7ba09df900a034ed93b1ee7cb62dd10c95e11ca6f' 
  AND token = 'Na1uYCS1HscZlrWZfT4hJ/OUANDlA39WBnj357VzT2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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