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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd342c2a9681856216d19a6ae8ea6e92dce36bab5d686d0a01733cfd65d8cfa9a' 
  AND token = 'YLb9STpnd3WROs1bFVxUfU0hbAo3z487qdR3FbiDB1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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