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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a61201cf63c4e327a4c2ebb5ce90cf8f6f737b8c5a0ee8f3e22766543b06e8bb' 
  AND token = 'RAWejCbgTOU+1kL0/4GVvnrQUe6hcq+DhbZAtOvKZxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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