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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f4b2e00daa2b4d9d6674355bc98d0ea74985ecb8fa6fc9a8794f43329829ec' 
  AND token = 'oTH634EFzwGdrQRfg0ViozylytsKY8aaxDjurcT1/94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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