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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3cc5c04a76cc52c80abe6ee3e8edca033acfbcde31b092c9b6f199c7892e839' 
  AND token = '9Xu6ZO7DZ2pfx2I81hLi3Ov4Rkqnv17JI1yXunyE0a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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