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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f413c2c0960d8d555ebf7d06535d24b646eef3801d24daaa4e3dba4bb5d0cb7' 
  AND token = 'AvXMARCgZ9R2txGuiotACONbtQbZ5mSsqoaER432u+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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