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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68857348f241059a19c2d062ea8b5bae96aca5084364dac886d88b853c073b5e' 
  AND token = 'rXCQDD3dI9sIbjrnzD6PHc2/nXL7CEDOUGGJQ6DXUsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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