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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '793f237cc162c2977d488ace44b1069bf9f4a9a56f3882a67c8279e2572e41f7' 
  AND token = 'SbneL1Rrdg7DQCWF3PPF5IrpVp0qbMsTe9E3StLjvho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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