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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1120cf1b946930810247ae0dd07fbb44adcbd7b79b811b52a195e6bdc4c80fb' 
  AND token = '8TzfB6xNE1jj1A78up/cbDQj743ujuaeB8rw9mIHvL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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