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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24fecd6c5f88ddfac997d418a7d081ce24d640c7ee807437a35e765262f776a3' 
  AND token = '8f885lufudfqWhRj5n3qwyyrRlbxcu+JcqT2d8mNFZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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