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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb47cd569f0d0b74a213d7cf637d48cb3a923fcbffb8fbbc525d0fa5ad25d770' 
  AND token = 'UP4/ncCsfz4TSXQRToo+CXVPFJS9TMrQwmXTcWfO5QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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