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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b76076225dbedbe42e5c07f3a4b070da7cb0517842361637ed775e892c7894a' 
  AND token = 'iI1FLRMGfFFa+6zWGLNnZN9Fww0rxjKs9qgsGrvndOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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