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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cabc7fda8c7d0f6e2debf9ab1fd6ce3b998c5e4a5c6bda909fb2c8a921c32be' 
  AND token = 'r5n7Fi87JkhtJSmxCgSsNBLaz9U1nOyaAgIVth+orrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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