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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '076830621a71bbce5ff9fa7feaaee1ef2dd3157b761d2854135244a1608616d1' 
  AND token = '8pplaF3MA7uUv4XdTzrlDEsoG4YlTqeSOHtWtm3TAc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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