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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '094712ba5f4c75efda2f6b1f03557de176b02af77b05ab516f71eb782153e69e' 
  AND token = 'Rj6E4d5LLXE5xNO5EVqVg7Jmn0Mim2KX9URDKrsXGSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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