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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fedcd651cbdbb972b439d6de0700837142b51e2921da878f064bd1c74918a6a' 
  AND token = 'og9MckRED7+RiQqDvRO6j2JHh6ryOV3qi73Y9QccMu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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