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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7d784ab855e3d6c7891e75c28d18cf7cbb05b111df97e5af3b5ff0e6a12958c' 
  AND token = '0W5nA+T6ZEbYgpi0b3elp4b69WGqWohfhmauu0AzP6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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