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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18caab188fab6a85d586c99626e095433bafb8e40b65dd9d80cda5c9486eb76c' 
  AND token = 'vOClbSwNGBvyVJA0oPx2AWFNvbakbeKiaZof9N5L4Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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