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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e923e8ce0428e3f93a873e35a36f4af00914fd7e327c8f00ebf8e4561d7863f' 
  AND token = 'oMi9gWs2cR+AA+R5B5SPHygd4u+K3vB6NxwQpKh8+sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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