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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61e3c24dfa58ff2292bd8ea2cf0dcecbc70e3971148db5a8ad9009e9fd6791a3' 
  AND token = 'bvxwG65xpy/FhSFWWV1pmU433ocE6bkzBBMHow7iyow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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