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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dde69edcc8164a0fae567303af3adb3634a26b16a7cf515b9ab9586b9b6d4151' 
  AND token = 'JTGKLdj6F5l96GANYcu9xFzyuIkYjo1JV2CyCP+qatw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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