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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83135b2dfa0e4e49b419d3f5826401b707d0b3223a9d481e59efc5eb70f3bd7a' 
  AND token = 'KgL84mVC27cNsK6tiiiyEDRsORuNSbaQUpDB/bUaNsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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