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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2f080d0187c2089c22338636d317f97bac60490441d11f37ddf50899176f5ae' 
  AND token = '798TjEd/atK84CSfX9X+DBVSG8cbQ8AXMH15z19BihI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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