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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ce443cfe2c776dda8b019ebe2b45e099e9571898d8c11a510e1ab21606dc11f' 
  AND token = 'BJpmdtiq/8/gTvM8OmGs51dN1w189KOvGHeYxYboX8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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