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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7175852fb6d7b39cd29104cf89ee4051331638b2aba40429cb664291d30f42cc' 
  AND token = 'jDgGDmQyqtWqdaHMNXZH9xNIWTtASX4FrTl9ZGLwyjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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