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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '396756c2f799d9f24e825c1b1b74c941a68eccf0d461dcc0c39c7eb126393816' 
  AND token = 'bazkcp6GyuWVe86V1T9eS8FRcZV+TOfyRHpHxRlpFcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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