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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eca76dd3dd2e49d923f939756bb57fd7348071486fa0726bec59f82d14e0578f' 
  AND token = 'vzJmKbyqE/CPy/k675QvdA7f69QfP79ALOWXokaAPlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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