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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbdeaf69d7ba3d3e6c961a11c79ad3b3fa3dcc3e4da9ef50f00fad7d9d86965e' 
  AND token = '67iBVrqjuaRsi9fi9li+9mbRcOR4lmI4gzPRsvaboZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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