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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a49acc09ba60626715cfe5e6f85bdf145455f7e743438654674492e0795f237' 
  AND token = '+Q/vfEHwldOfFc6H8URn9W6LlcUlffU49ASKpm0DgwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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