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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '160e06ed24ed75c64c5149abc4891d0788ae9e7a89f9f3cec68f7b4707fbae6c' 
  AND token = 'OTR4NzV91SOqUye2iSoBbAz4ALxWx7PbGWHTUE7GUHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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