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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c113b436c118015b7d1e67e4c183533d0851d41321c73a65a703cd62b21dd49d' 
  AND token = '5aHQr1K/pX0NMH3g5SmilztFZMbNBz/HE8iNIgu/pMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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