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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3fcc1f03fdbf38c443f8a76a8d73853d5d4dfcd3bc5352fb197f18768ba6bf5' 
  AND token = '2TTtCWsncSEI9108iE7GRwHftgUuSQsC4lXYmQ6m5d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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