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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24f8b42acf7c0f73ce819d72a1ec7931bb522a95da01b48f51ecf51f7f1ac7e2' 
  AND token = 'PFRTM7EiF0hwjpS8OAhnW2D9G184IUhaJq9eH3zIAGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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