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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5871352c158e7477da4b0381e1f2fd0ab7e3402cc242fe6e5ea92696b2e308d7' 
  AND token = 'fGgOp6UrlxVNU0nem/hh08MpJj6dwy4xMmIAcqvaNls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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