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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc76b59a49c2ff156c1441a9f448b30d4f304a48384afafe39149019321b799' 
  AND token = 'LgaIO1ZSl43hR6UB3C+xD1MsY3f+c3tDxQ3LVv5p9h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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