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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c397d2ba7e4f671d5219a5fbffbdb028f5c38c63bf021de0c1f2a5557bedecae' 
  AND token = 'nH013y3hF1MWIh/X1U/rE3cwSDGmCAnCidlu2MbdGHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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