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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76acd1882ce52c73f1510c2adc6fa0a4189f569a98edacfdb016d0544fb5f4bb' 
  AND token = 'bXQQLyOq1Zs6doOo7LLdR8rz03eDGXnNX3oRnixt/Lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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