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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b9dfee9e6b8786e9e8c6cd86f0fa232aeed5ad4a86153d289d0061e9618f5f9' 
  AND token = '65QJBi0WcrBD1VElXMgu4njIozWoqODRkbTawmrr1hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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