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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ce8c072a71ed935cca7b0b6922eb0f031da3686a16d2db34d9097aea7de036' 
  AND token = 'QL7e41/ASu02yuhlh54Hx+eokiRb2dstprrIXrwo/Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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