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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72f6acef6b39a3a44002eb116e5c55627c84d65fc8d095cf8dcf0c7b7e16e544' 
  AND token = 'NquPIF7kaCdRrTwhfgT9I7n58fmSIVCLVCElT9m9pVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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