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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6793bafd2c5a859ffe21a36aa90c8f55977a07d09cd548eac86862cb505c8d2' 
  AND token = 'l28/7iZzkvX9oadeMKkZc2DvZT/Qs+b2I+N0jvBXD7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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