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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '734b95faf8c9c7207a01aa16b93b9d6156c9ae19960cfa5dfd79af6a7ba461a2' 
  AND token = 'G7LqlKnR9UyjWNHOmt4anhveNawSh+bpEYYcHw+kTrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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