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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7e529aab0e43e25110b2342e7f12d22b87e510c1388c69d257724f5d0a64301' 
  AND token = 'rWNqAZNm1QQumgcC19jYKLnDk2T2/tmTubARv33jtn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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