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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90dd48b13e6ee04c06f16261a793c65f57338ba0f6441e8b101291f7d7c2d0b7' 
  AND token = 'voLTgNUa8x5pUl0l2iE487Vnh9a/CgKXqN2puR7xcq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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