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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce60334cdec44441b57fc4f8ad796c46cd553e32f40ac84878b256e9ae2152d9' 
  AND token = '74qLB7hC+yrYLlk8oTXx+7N9dP0kRIekGF+tSJD2S8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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