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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0904bdb353c9df42b0358dd2774fdc8a01b7b8e7c7d5924e7b0ad8fe27acc453' 
  AND token = 'm+++qahWnXAl3jLtDcz5Rmx3EtHHbbmxfXWkxoe4syQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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