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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc3795979e8d3689819a8c2ae41174826275af23a5cf8b7b3a4cfab0b081490' 
  AND token = 'XGzTrPA1jdXgR83+lXyG+NKNWYR6i88R5K2ohsLnuCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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