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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f619cdd33e95513d4ca21dc4870ab121cd1898f7caa25110cd2da77b744f9975' 
  AND token = 'p6Iz244pPJNriJ18dTi6hfPV1FbgwYwsDVL+aN5+e+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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