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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6111a9226e85bc1851d1c04deb6d6755b78f862ae538d30d418f570783bc7342' 
  AND token = 'bZmsP3WkJu3XBjdBh6m5muUV31Ma67fhFvi/K7orlDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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