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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b69a71c084214bddfa461d85b27406ef3d8b33e0d4913f4d78a53eb2b1e1848' 
  AND token = 'TXEpp/ainvnntStLA9Bla/PDzkBFa50L6zT/jW/QuBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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