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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c4150c026355ca4254660f389a095f7a820bd8da240661d0ce0be7d712c88a2' 
  AND token = 'bXeCSn67kRcUxqPRGMjagob6LbGZ4eBA7GNu4DR0j38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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