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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3485b7d5551e027e2f18d92a07b79a6730f79a7b8d3500b551995425d5428e75' 
  AND token = '/qBkIXCP6zfnBidT9dn7i/U3NGs3kvoV9JQZId8rNQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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