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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0642d971bea4416892ad09552d03efc1b4e1f74aabcc4a8ff22802522a5c8cfc' 
  AND token = 'Tc4gpSKU/wEecULzhr6/HsgbHa8zjrGK7KasrWAKQSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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