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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c6be78d214c5142d835d1c2d4e0dceeb9c30ddd234710abe5af76ae015959d' 
  AND token = '1ztGJFC6m3scHEp0zRK48GldBjQftygYmqz/zhyfI5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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