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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eab7177461d2695c363969340612ba13e457f1e0734ee38d3ddd7398396e9392' 
  AND token = '+TTl5fwmllpGVeXYoPuLYN9U5zDZVN/tbRnKnMSsL2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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