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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4048c8ed59e98a796abb40a4393f23625f921ffcf87bad00a7b97b94ed61c00e' 
  AND token = 'Oadqr0d5VW4lhArlPoyQPiRy+cWm2p8ep5NBNWXTcH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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