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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08fdbb2af6d608844c647e2b51820805bcff20fddf29320e4035d3b74537e61b' 
  AND token = 'Z+cmeYPqHVrJHqOTSRlZIAJw5Si/AkP7AC1bgbCe63s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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