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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8bca5f0e2c0460e7e277b9190ecd09e41edd43484bfc1c5dedc2a3cd2152bb0' 
  AND token = 'dlNme4UV0gyq0ah2xJzfzup80FBFfRMH09EGrd6qhQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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