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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b0b9f674c7a44590dd310c214848998b037977404111e4c3e5417558ffc914f' 
  AND token = 'FXzp+86nnhA0NW8ikT4eGZQE6oeEXcCGh4oOGuK2O0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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