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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77ae7bc19f1963f278230ab626543e45e5ad5039e58801cf5e79e05ad5d72aa5' 
  AND token = '7evue/S6+3RBUDdTP+YfJzVqheltktBzc5WQzLYkNXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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